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Pilot plant test of BF gas deep desulfurization technology |
DAI Xiao-tian, CHEN Qian-ye, QI Yuan-hong, YAN Ding-liu |
State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract In BF gas, the content of organic sulfur, which is mainly COS, is high while the content of inorganic sulfur is comparatively low, so that BF gas is difficult to desulfurize. Aimed at above difficulty, a BF gas deep desulfurization process, a dry process before gas combustion, was developed and tested in pilot plant scale at a metal company in Shandong province. The process scheme was as follows. The desulfurization test equipment was mounted at downstream direction of the blast furnace TRT module, and BF gas was connected to the desulfurization test equipment from the blast furnace′s gas pipe line through the bypass. The hydrolysis and desulfurization reactors were both packed beds, and designed as two-stage series connected type, which were "primary hydrolysis + desulfurization" and "secondary hydrolysis + desulfurization" modules. The hydrolysis and desulfurization reactors were filled with an improved Al2O3 based low-temperature hydrolysis catalyst and ferric oxide based desulfurizer, respectively. The hydrolysis catalyst promoted the reaction of COS with water vapor to produce H2S in BF gas, and then the desulfurizer reacted with H2S to produce Fe2S3. Thus, sulfur was removed from BF gas. In the pilot plant test, the gas flow rate was 400 m3/h, the gas temperature was about 80-100 ℃, the volume percent of COS and H2S were about 70% and 25%, respectively, and the total sulfur content of BF gas was 145 mg/m3. After more than 300 h of continuous running, pilot tests show that after processing, there is no waste water discharged, the converting rate of COS into H2S is about 99%, desulfurization rate is more than 96%, and the density of sulfur dioxide in exhausted gas (after combustion) is less than 10 mg/m3.
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Received: 06 July 2021
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